Thanks you for your work and the « bleep ».About the sound, in your second version, if you listen well, the sound stops suddently, but in the record, the sound stops gradually; so I don’t know if you have understand because I can’t explain well :/

So, in the original file at the end we hear less and less the sound but in your filter, the noice-reduction-filter is a bit too sensitive, and it makes the sound stops suddently at the end.